## Question

###### In some versions of FORTRAN, an identifier consists of a string of one to six alphanumeric characters beginning with a letter. (An alphanumeric character is one of A to $\mathrm{Z}$ or 0 to 9.) How many valid FORTRAN identifiers are there?

In some versions of FORTRAN, an identifier consists of a string of one to six alphanumeric characters beginning with a letter. (An alphanumeric character is one of A to $\mathrm{Z}$ or 0 to 9.) How many valid FORTRAN identifiers are there?

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